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High process gain opto-electronic matched filters for communications applications

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Abstract

This paper is concerned with the application of opto-electronic signal processing to a certain class of interference-resistant communications techniques. The processing techniques are applicable to spread spectrum digital transmissions which are processed by a matched filter at the receiver. The analysis of optical delay line matched filters of the diffraction type is discussed. The analysis considers the basic ultrasonic light modulator, that is, the modulation of a light source by a sonic wave. The sonic wave may represent a received spread spectrum signal or received noise or a combination of both. Two ultrasonic modulators in cascade perform the desired correlation or matched filter function. The analysis considers the effects of intermodulation of signal and noise and also the effects of the beamspreading and attenuation of the sonic signal in the delay lines. Finally, the design of a matched filter having 40 dB process gain is presented together with an estimate of its communications performance.

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Abbreviations

ω :

angular frequency of light source

λ :

wavelength of light source

t :

time

ν :

velocity of sonic wave

s 1(t)+φ 1 :

phase of signal input to first delay line

n(t) :

phase of noise input to first delay line

s 2(t)+φ 2 :

phase of signal input to second delay line

ω 1,ω 2,ω n :

angular frequencies of the carriers ofs 1(t),s 2(t) andn(t) respectively

λ 1,λ 2,λ n :

wavelength, in quartz, corresponding toω 1,ω 2 andω n respectively

μ 1,μ 2,μ n :

maximum change in refractive index due to signals corresponding tos 1(t),s 2(t) andn(t), respectively

J r(X):

Bessel function of first kind, orderr and argumentX

L :

width of sonic beam in direction of incident light

SNR:

signal-to-noise ratio

IM:

intermodulation

IMN:

intermodulation noise

M :

process gain factor

f c,λc :

frequency and wavelength of sonic carrier

2f d :

bandwidth of sonic signal

m :

f d/fc

Kbps:

kilo-bits-per-second

Mbps:

mega-bits-per-second

Kpps:

kilo-pulses-per-second

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Author information

Authors and Affiliations

  1. The Boeing Company, Seattle, Washington, USA

    G. Roome, A. V. Bunker & P. J. De Faye

Authors
  1. G. Roome
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  2. A. V. Bunker
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  3. P. J. De Faye
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Additional information

The studies reported in this paper were performed under contract AF30 (602)-4268, Optical Signal Processing, under the direction of Mr R. R. Menard of Rome Air Development Center, Rome, New York, USA.

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Roome, G., Bunker, A.V. & De Faye, P.J. High process gain opto-electronic matched filters for communications applications. Opto-electronics 3, 77–91 (1971). https://doi.org/10.1007/BF01424085

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  • DOI: https://doi.org/10.1007/BF01424085

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